Returns the company employee directory, including a fieldset definition and an array of employee records. Only returns employees with an employee status of 'Active'. By default only current employees are returned; pass onlyCurrent=false to include employees where hire date or employment status are in the future. If the caller has org-chart access but not full directory access, a reduced fieldset is returned. Returns 403 if neither directory nor org-chart sharing is enabled for the company. Returns 404 if the directory is empty. The response format is controlled by the Accept header.